The problem with that argument is that they can't JUST change the keyboard, since they aren't exactly the same size. So there are probably going to be some other internal changes like the improved cooling system and the improved speakers. I'm not sure about the screen, but I'm sure they'll include all other improvements of the 16", just to keep both sizes "Pro". And honestly, if you put a 15" Pro right next to a 16" Pro, you can barely see the difference. Put them a few feet apart, you'll see no difference in size, so I won't be dissapointed if the 13" stays at that size.